Fics like Manufactured Heartbeat

Wanting nothing more than to be a hero, but accepting that as he is, he cannot make it into UA, Izuku Midoriya decides to forge his own path into the school with his own two hands. With a robot body, and a pseudo quirk made from support gear, he won't let anything stop him. But piloting this new body means his real one is a sitting duck. The best way to hide that? To accept this new body as an alternate identity entirely, one which does not announce their robotic nature. And so, the name he made for this robot, Midori Diana, becomes his new name to accept. He probably should've thought things through a bit more before making it a girl, however. Or maybe the thinking can be done afterwards. The rest of the class seems to be in the dark, assuming it to be a mutation, far from the strangest many have seen. Jirou Kyouka on the other hand, is able to hear every whirring of the joints, and most importantly, the distinct lack of a heartbeat. Intrigued by the mystery of her new classmate, and eventually delighted to be a part of the trickery, she begins to learn the real Midori Diana, and Midoriya Izuku in turn.

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